CN102817882A

CN102817882A - Single-displacement locking oil cylinder

Info

Publication number: CN102817882A
Application number: CN2012103388128A
Authority: CN
Inventors: 牟太有
Original assignee: JULI (LUZHOU) HYDRAULIC INDUSTRIAL Co Ltd
Current assignee: JULI (LUZHOU) HYDRAULIC INDUSTRIAL Co Ltd
Priority date: 2012-09-14
Filing date: 2012-09-14
Publication date: 2012-12-12

Abstract

The invention discloses a single-displacement locking oil cylinder, which comprises a cylinder barrel, end covers arranged at two ends of the cylinder barrel, a piston rod, a piston arranged on the piston rod, a guide sleeve, a rod cavity oil port and a rod-free cavity oil port, wherein sleeves are fixedly arranged at one end of the piston, which is close to the rod cavity oil port; a steel ball is arranged in each sleeve in a sliding manner; one end of each steel ball, which is close to the piston rod, is positioned outside each sleeve in a radial direction; a mobile plug is arranged on the piston rod in a sliding manner; a spring is arranged between the mobile plug and the guide sleeve; a limiting check ring for positioning an extreme position at the front end of the mobile plug is arranged on the inner wall of the cylinder barrel; a convex ring is fixedly connected to the front end of the mobile plug; the outer diameter of the convex ring is smaller than that of each sleeve; the spherical center of the steel ball is higher than the outer circle of the convex ring in the radial direction; the diameter of the steel ball is greater than a difference between the inner diameter of the cylinder barrel at the piston section and the outer diameter of the convex ring; more than one groove is formed in the inner wall of the cylinder barrel in the radial direction of the convex ring; and the rod cavity oil port is positioned outside the piston rod in the radial direction and extends between the piston at the extreme position and the mobile plug. The single-displacement locking oil cylinder has the advantages of simple structure and large locking force; automatic operation for locking or releasing can be realized; and a phenomenon of failure is avoided.

Description

Single displacement locking cylinder

Technical field

The present invention relates to a kind of locking cylinder.

Background technique

The mechanical lock locking oil cylinder that uses at present, a kind of structure that locking nut is set on the piston rod that is employed in, its shortcoming is: 1) need artificial locking or unclamp nut, can not realize automatic operation; When 2) piston rod bore big load, screw thread was yielding, slippage takes place or kill phenomenon, causes inefficacy; Another kind is employed in piston rod brake axle watt, and the butterfly spring through hydraulic mechanism controlling and driving bearing shell is set outward; The locking cylinder of this structure not only structure is comparatively complicated; Its coupling mechanism force receives the friction factor restriction of the in the wrong strong coefficient and the bearing shell of butterfly spring, and its coupling mechanism force is limited.

Summary of the invention

The objective of the invention is the above-mentioned deficiency that exists to existing technology, a kind of single displacement locking cylinder is provided, it has advantage simple in structure, that coupling mechanism force is big, and can realize the automatic operation of locking or unclamping, and is difficult for losing efficacy.

For achieving the above object, the technological scheme that the present invention adopts is:

A kind of single displacement locking cylinder; Comprise cylinder barrel, be loaded on the cylinder barrel two ends end cap, piston rod, be loaded on piston, guide sleeve, each Sealing, rod chamber hydraulic fluid port and rodless cavity hydraulic fluid port on the piston rod; It is characterized in that: be installed with more than one sleeve radially near an end of rod chamber hydraulic fluid port at piston; That in each sleeve, all slides is provided with a steel ball, and an end of steel ball adjacent piston bar is outside the sleeve that radially is positioned at separately, and that on piston rod, also slides is provided with a trip plug; On the piston rod between trip plug and the guide sleeve, be provided with spring; Be provided with the spacing back-up ring that trip plug front end limit position is positioned in inner wall of cylinder, the front end of filling in trip is fixed with bulge loop, and the external diameter of bulge loop is less than the internal diameter of sleeve; The centre of sphere of steel ball is at the cylindrical that radially is higher than bulge loop; The diameter of steel ball is poor greater than the internal diameter of cylinder of piston section and bulge loop external diameter, on the inner wall of cylinder of bulge loop place radial direction, also is provided with more than one groove, between the piston of said rod chamber hydraulic fluid port when axially outside piston rod, reaching limit position filled in trip.

During use; When the oil-feed of rodless cavity hydraulic fluid port, it is overhanging to promote piston rod, when sleeve move to bulge loop when radially overlapping; Bulge loop outwards pushes each steel ball in the groove separately; Steel ball can't moved axially by the restriction of bulge loop and groove, causes piston and piston rod also can't move axially, and reaches the purpose of auto lock; When the oil-feed of rod chamber hydraulic fluid port, trip plug pressurized moves backward, and steel ball withdraws from from groove radially moving inward, and hydraulic oil promotes piston reset, realizes automatic unlocking; The present invention is through non-friction is realized locking to steel ball is spacing, and coupling mechanism force is bigger;

As a kind of preferred, said piston is fixed on the piston rod through step on the piston rod of both sides and nut, and steel ball is positioned on the step, and the internal diameter of bulge loop is greater than the external diameter of step; So can reduce the size of steel ball, thereby dwindle the degree of depth and the thickness that increases bulge loop of groove, can reduce the diameter of cylinder barrel, increase the intensity of bulge loop, further guarantee the soundness of locking;

As a kind of preferred, on the inside and outside circumference of trip plug, be equipped with Sealing; Can reduce leakage;

In sum, the advantage that the present invention has is simple in structure, coupling mechanism force is big, and can realize the automatic operation of locking or unclamping, and be difficult for losing efficacy.

Description of drawings

Fig. 1 is the plan view of inventive embodiments.

Fig. 2 is the left view of Fig. 1.

Embodiment

Below in conjunction with accompanying drawing, the present invention is done detailed explanation.

Like Fig. 1, shown in Figure 2: this single displacement locking cylinder; Comprise cylinder barrel 1, be loaded on end cap 2 and 3, piston rod 4, piston 5, guide sleeve 6, each Sealing 7, rod chamber hydraulic fluid port 8 and the rodless cavity hydraulic fluid port 9 at cylinder barrel two ends; Said piston 5 is fixed on the piston rod 4 through step on the piston rod of both sides 10 and nut 11, is installed with several sleeves 12 at piston 5 near an end of rod chamber hydraulic fluid port 8, and that in each sleeve 12, all slides is provided with a steel ball 13; One end of steel ball 13 adjacent piston bars 4 radially is being positioned on the step 10; The trip that is provided with of on piston rod 4, also sliding fills in 14, on the inside and outside circumference of trip plug 14, is equipped with Sealing 15, on the piston rod 4 between trip plug 14 and the guide sleeve 6, is provided with spring 16; Be provided with the spacing back-up ring 17 that trip plug front end limit position is positioned in inner wall of cylinder; Front end at trip plug 14 is provided with the bulge loop 18 that is fixed with one, and the external diameter of bulge loop 18 is less than the internal diameter of sleeve 12, and the internal diameter of bulge loop 18 is greater than the external diameter of step 10; The centre of sphere of steel ball 13 is at the cylindrical that radially is higher than bulge loop 18; The diameter of steel ball 13 is poor greater than the internal diameter of cylinder of piston section and bulge loop external diameter, on the inner wall of cylinder of bulge loop 18 place radial direction, also is provided with several grooves 19, and the piston 5 of said rod chamber hydraulic fluid port 8 when axially piston rod 4 outside, reaching limit position filled between 14 with swimming.

During use; When 9 oil-feeds of rodless cavity hydraulic fluid port, it is overhanging to promote piston rod 4, when sleeve 12 move to bulge loop 18 when radially overlapping; Bulge loop 18 outwards pushes each steel ball 13 in the groove 19 separately; Steel ball 13 can't moved axially by the restriction of bulge loop 18 and groove 19, causes piston 5 and piston rod 4 also can't move axially, and reaches the purpose of auto lock; When 8 oil-feeds of rod chamber hydraulic fluid port, the resistance that trip plug 14 pressurizeds overcome spring 16 moves backward, and steel ball 13 radially can move inward, and from groove 19, withdraws from, and hydraulic oil promotes piston 5 and resets, and realizes automatic unlocking; The present invention is through non-friction is realized locking to steel ball is spacing, and coupling mechanism force is bigger; The setting of step 10 can reduce the size of steel ball 13, thereby dwindles the degree of depth and the thickness that increases bulge loop 18 of groove 19, can reduce the diameter of cylinder barrel 1, increases the intensity of bulge loop 18, further guarantees the soundness of locking.

The above is merely preferable enforcement example of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims

1. single displacement locking cylinder; Comprise cylinder barrel, be loaded on the cylinder barrel two ends end cap, piston rod, be loaded on piston, guide sleeve, each Sealing, rod chamber hydraulic fluid port and rodless cavity hydraulic fluid port on the piston rod; It is characterized in that: be installed with more than one sleeve radially near an end of rod chamber hydraulic fluid port at piston; That in each sleeve, all slides is provided with a steel ball, and an end of steel ball adjacent piston bar is outside the sleeve that radially is positioned at separately, and that on piston rod, also slides is provided with a trip plug; On the piston rod between trip plug and the guide sleeve, be provided with spring; Be provided with the spacing back-up ring that trip plug front end limit position is positioned in inner wall of cylinder, the front end of filling in trip is fixed with bulge loop, and the external diameter of bulge loop is less than the internal diameter of sleeve; The centre of sphere of steel ball is at the cylindrical that radially is higher than bulge loop; The diameter of steel ball is poor greater than the internal diameter of cylinder of piston section and bulge loop external diameter, on the inner wall of cylinder of bulge loop place radial direction, also is provided with more than one groove, between the piston of said rod chamber hydraulic fluid port when axially outside piston rod, reaching limit position filled in trip.

2. single displacement locking cylinder according to claim 1 is characterized in that: said piston is fixed on the piston rod through step on the piston rod of both sides and nut, and steel ball is positioned on the step, and the internal diameter of bulge loop is greater than the external diameter of step.

3. single displacement locking cylinder according to claim 1 and 2 is characterized in that: on the inside and outside circumference of trip plug, be equipped with Sealing.